Help me in solving OPMIN problem

help
,
1

My issue

failed on hidden case

My code

#include <stdio.h>

int main() {
    int t;
    scanf("%d", &t);

    while (t--) {
        int n;
        scanf("%d", &n);
        int a[n];

        for (int i = 0; i < n; i++) {
            scanf("%d", &a[i]);
        }

        // Your code goes here
    }

    return 0;
}

Learning course: Data Structures & Algorithms using C
Problem Link: https://www.codechef.com/learn/course/ciet-data-structures-c/CIETDSC02/problems/OPMIN